package com.zhangxi.interceptor;

import com.zhangxi.constant.JwtClaimsConstant;
import com.zhangxi.context.BaseContext;
import com.zhangxi.properties.JwtProperties;
import com.zhangxi.util.JwtUtils;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;

import org.springframework.web.servlet.HandlerAdapter;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author zhangxi
 * @create 2024-04-24 18:52
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;


    /**
     * 校验jwt
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //直接放行
            return true;
        }

        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getUserTokenName());

        //2、校验令牌
        try {
            log.info("令牌校验：{}", token);
            Claims claims = JwtUtils.parseJWT(jwtProperties.getAdminSecretKey(), token);
            Long userId = Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
            log.info("当前用户id为：{}",userId);
            BaseContext.setCurrentId(userId);
            //3、通过，放行
            return true;

        } catch (Exception e) {
            //4、不通过，响应401状态码
            response.setStatus(401);
            return false;
        }

    }
}
